Re routing a soil pipe so the vent will be concealed behind sloping ceiling plasterboard between the roof joists.
Two questions.
Will AAV work with the 110mm vent pipe at 45 degrees?
If no, could I remove the valve, step down the 110mm pipe to 40mm and extend into the loft space. Would a 40mm AAV be necessary / preferable in the loft space or leave open? I can't extend the 110mm pipe past the roof joists but 40mm will fit.
Thank you!
Two questions.
Will AAV work with the 110mm vent pipe at 45 degrees?
If no, could I remove the valve, step down the 110mm pipe to 40mm and extend into the loft space. Would a 40mm AAV be necessary / preferable in the loft space or leave open? I can't extend the 110mm pipe past the roof joists but 40mm will fit.
Thank you!